StreamGeometry与DrawingContext.DrawLine在WPF C#中的比较
本文关键字:比较 WPF DrawingContext DrawLine StreamGeometry | 更新日期: 2023-09-27 17:58:01
我将实时绘制数百行。我选择了视觉层来执行此操作。但我看到这里有两种不同的划线方式。你建议哪一个能获得更好的性能和速度?
1.DrawingContext.DrawLine
public class DrawingTypeOne : FrameworkElement
{
private readonly VisualCollection _visuals;
public DrawingTypeOne(double thickness)
{
var myPen = new Pen
{
Thickness = 1,
Brush = Brushes.White,
};
myPen.Freeze();
_visuals = new VisualCollection(this);
var drawingVisual = new DrawingVisual();
using (var dc = drawingVisual.RenderOpen())
{
dc.DrawLine(myPen, new Point(0,0) , new Point(100,100));
_visuals.Add(drawingVisual);
}
}
protected override Visual GetVisualChild(int index)
{
return _visuals[index];
}
protected override int VisualChildrenCount
{
get
{
return _visuals.Count;
}
}
}
2.StreamGeometry
public class DrawingTypeTwo : FrameworkElement
{
private readonly VisualCollection _visuals;
public DrawingTypeTwo()
{
_visuals = new VisualCollection(this);
var geometry = new StreamGeometry();
using (var gc = geometry.Open())
{
gc.BeginFigure(new Point(0, 0), true, true);
gc.LineTo(new Point(100,100), true, false);
}
geometry.Freeze();
var drawingVisual = new DrawingVisual();
using (var dc = drawingVisual.RenderOpen())
{
dc.DrawGeometry(Brushes.Red, null, geometry);
}
_visuals.Add(drawingVisual);
}
protected override Visual GetVisualChild(int index)
{
return _visuals[index];
}
protected override int VisualChildrenCount
{
get
{
return _visuals.Count;
}
}
}
就像我说的,你只需要一个视觉,里面可以有你所有的线条。
看看这个:
首先,我们在绘图上下文中定义多个绘图:
class EllipseAndRectangle : DrawingVisual
{
public EllipseAndRectangle()
{
using (DrawingContext dc = RenderOpen())
{
// Black ellipse with blue border
dc.DrawEllipse(Brushes.Black,
new Pen(Brushes.Blue, 3),
new Point(120, 120), 20, 40);
// Red rectangle with green border
dc.DrawRectangle(Brushes.Red,
new Pen(Brushes.Green, 4),
new Rect(new Point(10, 10), new Point(80, 80)));
}
}
}
这是一个特殊的视觉或元素托管所有的图纸:
public class EllAndRectHost : FrameworkElement
{
private EllipseAndRectangle _ellAndRect = new EllipseAndRectangle();
// EllipseAndRectangle instance is our only visual child
protected override Visual GetVisualChild(int index)
{
return _ellAndRect;
}
protected override int VisualChildrenCount
{
get
{
return 1;
}
}
}
这就是如何在XAML中使用所有这些东西:
<local:EllAndRectHost Margin="30" ... />
我说的是DrawingVisual类,你可以从中继承,而不是为100行创建100个视觉效果。
关于你的问题,第一种方法更快。因为第二种方法最终也是如此,所以第一种方法只是包装得很好。CCD_ 1是最低端。你不能比DrawLine
更深入。CCD_ 3正在调用CCD_。